What is the required clearance above a walkway when locating a mechanical draft system?

The requirement for clearance above a walkway when locating a mechanical draft system is essential for ensuring safety and compliance with building codes. A clearance of 7 feet allows adequate space for safe passage, ensuring that individuals can walk beneath the system without risk of coming into contact with it. This distance is designed to minimize hazards associated with low-hanging equipment, which could potentially injure someone or impede movement in the area.

In many jurisdictions, including Arizona, adhering to these safety distances is not only a matter of best practice but also necessary to comply with local regulations and safety codes that govern HVAC installations. This clearance helps to maintain an efficient airflow for the mechanical draft system as well, supporting proper functioning while protecting occupants.

In contrast, the other options, while perhaps seemingly reasonable, do not meet the specified requirement for this specific application and may lead to safety risks or violations of code.